Grateless hot-air heater



April s, 1924.` 1,489,973

O. BELANGER GRATELE'SS HOTv AIR HEATER Filed Aufl. 20. 1923 Une] Blanger 91,WWC

Patented Apr. S, 1924.,

UNIED STATES OREL BELANGER, F DERBY, NEW HAMPSHIRE.

GRATnLEss Hom-AIR HEATER.

Application led August 20, 1923. Serial No. 658,458.

T 0 all whom t may concern.'

Be it known that I, OREL BELANGER, a citizen of the United States, residing at Derry, Ain the county of Rockingham and State of New Hampshire, have invented certain new and useful Improvements in Grateless Hot-Air Heaters, of which the following is a specication.

My said invention relates to a grateless heater1 and it is an object of the same to provide a simple and inexpensive construction adapted to utilize solid fuel for heating air or other heating medium without the use of a grate.

Referring to the accompanying drawings which are made a part hereof and on which similar referencev characters indicate similar parts,

Figure 1 is a vertical central section of a hot air heater illustrating my invention, and

Figure 2, a section on line 2 2 of Figure 1.

In the drawings reference character indicates a base which may be of steel and comprises a flat bottom and a iirepot 11 of tubular form which may be cylindrical or square or of any other preferred form. A forward extension from the firepot is provided with a door 12 for removal of ashes and the repot is lined with brick 13 so that fuel of any desirable character may be burned, the ashes falling to the bottom and being removed through the ash door. The

Y enlarged upward extension or drum 14 all of which preferably is also formed of steel is provided with a flat top and is adapted to receive the smoke and heating medium as hot air and afford a large area of contact with the outer air on one side and the heated air on the other side to produce a maximum heating eect. The drum is provided at one side with a fuel opening closed by a door 15 and at the other side with an outlet 16 for smoke.

An arcuate shield 17 extends about the rear of the drum 14 approximately in line with the rear wall of the iirepot l1 and is secured to the drum 14 at the top and at opposite edges by radial portions 18 of less height than the shield so as to leave passages at 19 through which the smoke may pass from the central chamber toward the outlet. In the form shown in the drawings the ends of the shield are approximately at opposite ends of a diameter of the circular casing, but this is not essential. The draft for the fire passes through the ash door and the rearward passage to the central chamber, then upward, then divides so as to pass at opposite side edges of the shield and so to the smoke outlet.

Surrounding the heater proper there are a pair of concentric casings 20 and 21 of sheet iron or the like, kthese casings having openings to accommodate the extensions 16 for the smoke outlet and the extension at the other side forl the receipt of fuel. Preferably also the outer casing is cut away at the front to provide space for extensions 22 fixed to the steel body of the ldevice and flaring out from the fuel door. At their upper ends they casings 20 and 21 are held in Vspaced relation by a plate 23 of convenient form here shown as having concentric depending flanges. In the operation of the device the airwill pass up through the space between the heater proper and the inner `casing 2O and out atthe hot air outlet 24 and will so create a downward draft by way of the cold air inlet 25 between the casings 20 and 21 to replace the air rising in the inner space.

It will be understood that many changes can be made in my device without departing from the spirit of the invention and therefore I do not limit myself to the specific mechanism shown in the drawings and described in the specification but only as '1ndicated in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a furnace, a casing having a fire pot at its lower end and having its upper portion forming a drum, a fuel door at the front of said drum, a smoke outlet at the rear of said drum, a shield spaced from the drum and having its ends inturned and secured to the sides of the drum, and openings through the inturned ends of the shield for the passage of smoke into the smoke outlet.

2. In a furnace, a casing having its lower portion lined to provide a fire pot, a passage leading out from the fire pot adjacent its lower end, a door for closing said passage, said casing having its upper portion enlarged to form a drum, a fuel door at the front of said drum, a smoke outlet at the rear of said drum, a shield spaced from the drum and secured by radial portions to the sides thereof and passages through said radial portions for the passage-of smoke into the smoke outlet.

3. In a furnace, a casing having its lower portion lined to provide a lire pot, a passage leading out from the r'e pot adjacent its lower end, a door for closing said passage, said casing having its upper portion enlarged to form a drum, a fuel door at the front of said drum,-a smoke outlet at the rear of said drum, an arcuate shield spaced `from the drum, and having radial portions formed integrally therewith, and openings through said radial portions for the passage of smoke into the smoke outlet.

4L. In a furnace, a casing having its lower portion forming a ire pot, a passage leading out from the fire pot adjacent its lower end, a door for closing said passage, said casing having its upper portion enlarged rto form a drum, a fuel door at the front of said drum, a smoke outlet at the rear of said drum, an arcuate shield forming a continuation of said lire pot spaced from the drum, and secured to said drum at substantially diametrically opposite sides by radial portions of less height than said shield providing openings for the passage of smoke into the smoke outlet.

5. In a furnace, a casing having a fire pot at its lower end, and having its yupper yportion forming a drum, a fuel door atthe front of said drum, a smoke outlet at the rear of said drum, a shield spaced from the drum and having its ends inturned and secured to the sides of the drum, openings through the intur-ned ends of the shield for the passage of smoke into the smoke outlet, and concentric casings about said fire pot and drum to provide a descending current of cold air andan ascending current of warm air, substantially as set forth.

6. In a furnace, a casing having its lower portion forming a combustion chamber, a passage leading out from the combustion chamber adjacent its lower end, a door for closing said passage, said casing having its upper portion forming a drum, a fuel passage at the front of said drum, a smoke passage at the rear of said drum, a shield spaced from the drum and having its ends inturned and secured to the sides of the drum, openings through the inturned ends of the shield for the passage of smoke into the smoke passage, casings around said combustion chamber forming passages for a descending current of cold air and an; ascending current of Warm air, said intermediate casing having apertures adjacent its lower end for the circulation of air therethrough, substantially as set forth.

In Witness whereof, I have hereunto set my hand and seal at Derry, New Hampshire,

this seventeenth day of August, A. D. nineteen hundred and twenty-three. 

